Tool technology and market In the future development of tools in China, in terms of tool manufacturing technology, the structure of the cutting edge has always been an extremely important factor in the working performance of the cutting edge together with the matrix material and coating technology. In terms of cutting edge geometry itself, there will still be a steady stream of edge structures, but the goal will most likely be to achieve a higher level of balance in terms of sharpness, impact resistance, chip breakage and stress and heating.

　　When it comes to tool manufacturing, an important measure to improve tools is to choose the right tool coating. There are two main methods of tool coating: chemical vapor deposition (CVD) and physical vapor deposition (PVD). At present, carbide indexable inserts for machining steel and cast iron parts, especially turning inserts, are mainly coated with CVD, while other tools, including solid carbide tools, are mainly coated with PVD. CVD coatings Currently, there are relatively few coating varieties that can be adapted: they are mainly used for Al2O3 coating and diamond (PCD) coating. Although there are not many suitable varieties, this technology still has great development prospects because one of these coatings (Al2O3) has a large market demand because it is especially suitable for processing steel and cast iron, and the other (PVD) is especially suitable for aluminum alloys for lightweight automobiles and carbon fiber reinforced composites such as aerospace and wind power. The author predicts that the development direction of Al2O3 coatings should be in obtaining thicker α phase Al2O3 layers, controlled nucleation and directed growth technology of grains, grain refinement technology, and reducing and eliminating microcracks and droplets of coatings. The development of PVD technology should show a diversified trend due to its own characteristics. It is expected that PVD coating will mainly be achieved by adding trace elements to improve the wear resistance of the coating, improve the heat resistance of the coating, reduce the friction of the coating-chip friction pair or the coating-workpiece machined surface friction pair, and reduce the transfer of cutting heat to the tool. On the other hand, the mechanical and chemical properties of the coating itself will be improved by refining the coating grains.